化学8.1（Chemistry (8.1)）.doc

化学8.1（Chemistry (8.1)） The following substances can conduct electricity, of which the electrolyte is () A. n aCl solution b. wire C. Dilute sulfuric acid d. fused NaOH [D]. NaCl solution and dilute sulfuric acid belong to the mixture, and the mixture is not electrolyte. The wire belongs to a single substance, and the single substance does not belong to electrolyte. The fused NaOH belongs to the compound and can conduct electricity, belonging to the electrolyte. So thats choice D. 2. (2011 weifang simulation) dilute the ammonia water with 0.1 mol · l-1 0.01 mol · l-1. The temperature in the dilution process is constant. The following statement is correct (a) A. The dilute solution of [H +] and [OH -] decreased B. Dilute the solution of [OH -] to 1/10 before dilution The ionizing balance of ammonia in the process of dilution moves to the left D. Increase in solution during dilution And thats choice D. Because in the dilution process, [OH -] decreased and Kw didnt change, So [H +] is bigger, A is not right; Because NH3 H2O is the weak base, the dilution process The degree of ionization is greater, so [OH -] is bigger than before dilution, and B is not positive Indeed; The dilution promotes ionization, NH3 H2O ionization equilibrium is shifted to the right, and C is not correct. on Im going to multiply by volume V, and then Im going to be, because the dilution is equal to the right Its going to increase, and n (NH3 H2O) decreases, so it increases Big, D right. 3. It is known that 0.1 mol/L of acetic acid exists in equilibrium: CH3COOH Ch3coo-+ H +, to increase the value of c (H +)/c (CH3COOH) in the solution, The measures that can be taken are () (1) add a small amount of caustic soda (2) to raise the temperature (3) add a small amount of glacial acetic acid (4) to add water A. (1) (2) b. (2) and (4) C. (2) (3) (4) d. (1) and (4) [resolution] B. Add a small amount of caustic soda, consume H +, so the value of c (H +)/c (CH3COOH) decreases. Raise the temperature to get t